Kitten who has vomited 3 times in last two days. What could be wrong?

My 14 weeks old kitten has vomited 3 times in last couple of days. Yesturday he vomited two times, which looked like (sorry) his dry food and then this morning soon as he got up he vomited some white little puddle of something on the floor.. dont know what it was but just looked white.. like water.. 
Unfortunately there are no vets near me opened today and there hasnt been for a whole week now because of the christmas holiday/public holidays. (really angers me) i was meant to take him for a vaccination last friday (Aus NSW here) and wasnt able to so decided would have to take him next week (which is this week now) and as i said, unfortunately nothing is opened  

Has anyone had there car vomit like that before? My kitten seems to be acting normal and his usual very energetic playful self and hasnt vomited for last 4 or 5 hours now but still.. little bit worried, what could be wrong.. or what could it have possibly been? 

Kittens put everything in their mouth, so it's possible he just got into something that didn't agree with him.  It could be as innocent as bath soap (yes, they will lick it, at least once), some other household chemical (think baby-proofing, here), or something off the floor, like a dust bunny or a piece of string.  The worst case might be a string or something that might cause an intestinal blockage, so watch for normal litter box deposits.

Intestinal parasites, particularly worms, can also cause vomiting.

Kittens are prone to stomach upsets, just like human babies; their digestive tracts aren't completely formed, yet.  However, repeated vomiting can lead to dehydration, so if it continues, it merits a vet visit asap. 

If the kitten hasn't been checked over by the vet, that is a #1 priority. 

It's true that kittens are more prone to vomiting due to various reasons. If he doesn't vomit anymore, you can rest assured, keep him hydrated though.

Just checking in to see how this kitty is doing today.  Probably just being a kitty!

My cat has vomited whitish water too, several times in a day like your cat.  It is most likely somethig your kitty ate, and the vomiting will pass.  Keep an eye on him and watch how much he eats.